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Preparation method and application of calcium carbonate particle

A calcium carbonate and particle technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems affecting the performance of PVC profiles, achieve good surface properties, good compatibility, and reduce the use of expensive additives.

Inactive Publication Date: 2005-06-29
上海建材(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the amount of nano-calcium carbonate added by ordinary processing is greater than a certain level (>20phr), there will be agglomeration in the organism, which will seriously affect the performance of PVC profiles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 40L of calcium carbonate slurry in the coating bucket, stir and heat up to 50°C, dissolve 1% (weight ratio, the same below) modifier in the same volume of aqueous solution, and mix the water and the modifier at 50-60°C Add the modifier into a colorless solution state, add the dissolved modifier into the calcium carbonate slurry, and stir for 20 minutes. Then the temperature of the slurry is raised to 75-80° C., and 1% of the saponified stearic acid is added to the above calcium carbonate solution, and the mixture is stirred and coated for 40 minutes. The rotor speed is 200 rpm. After the coating is completed, dehydration and drying are carried out to obtain white special calcium carbonate powder with an activation degree of >99%.

Embodiment 2

[0027] The specific implementation method is the same as Example 1, and the add-on of modifying agent is 2% (weight ratio, the same below), joins in the calcium carbonate solution at 60 ℃, coats 15min; The add-on of stearic acid is 0.5%, Add at 80°C and cover for 30 minutes. The rotor speed is 300 rpm. After the coating is completed, dehydration and drying are carried out to obtain white special calcium carbonate powder with an activation degree of >99%.

Embodiment 3

[0029] The specific implementation method is the same as Example 1, and the add-on of modifying agent is 1.5% (weight ratio, the same below), joins in the calcium carbonate solution at 60 ℃, coats 10min; The add-on of stearic acid is 0.5%, Add at 80°C and cover for 25 minutes. The rotor speed is increased to 400 rpm. After the coating is completed, dehydration and drying are carried out to obtain white special calcium carbonate powder with an activation degree of >99%.

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Abstract

Disclosed is a method for preparing calcium carbonate particle and its application, which includes the following steps: firstly burning, digestion and carbonization limestone, obtaining the mixture of nanometic calcium carbonate and micron calcium carbonate; do compound of coupling agent of titanic ester, coupling agent of aluminatic ester and coupling agent of boric esterto form a water soluble modifier which is added into calcium carbonate to package it; after packaging heat the sera and add soap having been saponificated into it with agitate, finally acquiring the calcium carbonate particle. The calcium carbonate obtained is filled with PVC-typed material, without coacervation even the quantity is large, can decrease the cost of PVC-typed material as well as the use of some assistant with high price on the basis of assuring the performance of it, meanwhile, the procession and plasticizing performance of it can also be advanced.

Description

Technical field: [0001] The invention relates to a method for preparing calcium carbonate particles and its application, in particular to a method for modifying the surface of nanometer calcium carbonate particles and its application. Background technique: [0002] Calcium carbonate is currently the most widely used inorganic filler in organic polymer matrix materials. Because of its low price and non-toxicity, it is widely used in rubber, plastics, papermaking, daily chemical and other fields. However, due to the distribution of strong hydrophilic hydroxyl groups on the surface of calcium carbonate particles, which are alkaline and have poor compatibility with organic polymer matrix materials, it is difficult to disperse evenly in the matrix material and form a strong binding force with the matrix material, resulting in The interface defect between the two materials reduces some mechanical properties of the composite material. Changing the performance of traditional calciu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 杨雪梅朱丽莹蒋旭华季慧君颜培刚黎绍北
Owner 上海建材(集团)有限公司
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